Quote:
Originally Posted by Morphyne
Ok folks. I've got a head scratcher. I have (what I think is) piston slap on cold start up. After a second, it goes away and it (2005 GX470) runs fine. Actually great. I just cleaned the throttle body, changed the oil and spark plugs bc that's all I know to do to throw at this issue. Any thoughts?
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Sounds more like something rattling (rod bearing) till it gets oil pressure. Not likely piston slap as it will usually take longer to go away than what you describe. Piston slap is pretty common on a lot of newer engines when cold and it usually goes away as the pistons warm up and expand to better fit the cylinders.